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If a man's face is 20 cm in front of concave shaving mirror producing erect image 1.5cm times the size of face , focal length of the mirror would be A)75 cm B) 25 cm C) 15 cm D) -60 cm |
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Answer» Answer: - 60 cm Explanation: Focal LENGTH,f=? object distance is= - 20 cm Magnification,1.5 = - v ÷ - 20 v= 30 cm using the MIRROR formulae 1÷ v + 1 ÷ u = 1 ÷ F 1 ÷ 30 - 1 ÷ 20 = 1 ÷ F 2-3 ÷ 60 = 1 ÷ F = F = - 60 cm... Hope this answer helps u...✌✌✌ |
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